255-100 Analog Output Evaporation Gauge
The 255-100 Analog Output Evaporation Gauge is used to determine the evaporation rate by measuring the changing water level in an evaporation pan. The sensor consists of a float, pulley, and counterweight attached to a precision potentiometer. Add the 255-100C signal conditioning option if 4-20 mA output is required.
The 255-100 Analog Output Evaporation Gauge is used to determine the evaporation rate by measuring the changing water level in an evaporation pan. The sensor consists of a float, pulley, and counterweight attached to a precision 1000-ohm potentiometer mounted in a weatherproof housing. The potentiometer produces a resistance output proportional to the position of the float which can be monitored on site using a data logger or remotely by telemetry equipment.
A standard National Weather Service Class A Evaporation Pan is recommended for use with the gauge. The NovaLynx 255-200 Class A Evaporation Pan is designed to be coupled to the gauge by means of stainless steel connecting pipes and fittings.
Addition of the 255-620-A Automatic Refill System maintains water level in the pan on a scheduled basis, reducing visits to the site.
The 195-704-B Evaporation Logger is one method of collecting data on-site from the evaporation gauge. This 4-channel logger can also monitor temperature sensors (sold separately) to read air temperature and the temperature of the water in the evaporation pan.
Users who have their own monitoring equipment can interface with the evaporation gauge in two ways:
1. If a voltage output is desired, the logger or PLC must supply a regulated voltage to the gauge (typically 5.00 volts). When 5 volts is used, the output of the gauge is 0 to 5 volts, changing linearly as the water level in the pan decreases.
2. If a 4-20 mA current output is desired, the 255-100C-4 Signal Conditioning circuit board generates the regulated voltage and its current loop output provides a proportional 4-20 mA signal. The 255-100C-4 can be purchased as a bare board or mounted in a NEMA enclosure (PN 255-100C-4N).
Specifications
255-100 Evaporation Gauge
Potentiometer:
Accuracy: 0.25%
Rotation: Continuous
Resistance: 1000 ohms
Operating temperatures: -40° to 60° C
Linearity: 0.25%
Range: 0-10″
System accuracy: Evaporation gauge with pan and pipes ± 0.25% over 10″ range
Float: 4″ diameter
Height: 27-1/2″
Diameter: 8″
Base: 16″ triangle with leveling screws
Water input port: 1/2″ NPT coupling, female
Cable: 3 conductor, 50′ included
Weight/Shipping: 7-1/2 lbs/15 lbs
Shipping box: 29″ x 17″ x 16″
255-100-P/F Stainless Steel Pipe & Fittings
Material: 304 stainless steel
Dimensions: 60″ long, 1/2″ NPT fitting
Weight/Shipping: 5 lbs/6 lbs
Shipping Info
Important Notes About Shipping Charges
Unless specific instructions accompany the order, we will use our judgment as to the best method of shipment. Most orders are shipped via United Parcel Service. Special arrangements can be made for other carriers. All shipments are F.O.B. Grass Valley, California. Title and risk of loss will pass to the purchaser upon delivery to the freight carrier. The purchaser is responsible for all transportation and insurance charges. Shipping containers are not returnable.
The shipping charges provided by our website shopping cart are estimated based on the individual items in your order. If you are in the United States and have ordered more than one item, the actual shipping charge will sometimes be less than the amount quoted. If we have overcharged you for shipping, we will refund the difference after your order is shipped. If the actual shipping charge is higher than the amount quoted, we will contact you before shipping your order.
If you have any questions or special requirements, or to request an exact freight quote, please send us a message or call us at +1 (530) 823-7185.
